PhysicsChapter 3: Waves
Frequency and Speed
Introduction
Frequency is the number of complete oscillations or cycles produced per second. Its SI unit is: hertz (Hz) The time for one complete cycle is the period T. They are related by: f = 1T and: T = 1f
Definition
Wave Speed
Wave speed is related to frequency and wavelength by: **v = fλ** where: v = speed f = frequency λ = wavelength
Worked Example
f = 5 Hz λ = 2 m v = fλ v = 5 × 2 **v = 10 m/s**
Exam preparation
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Review the key facts, formulas and checks before you move on.Frequency and Speed
Sticky Notes · Quick Revision
f
- Cycles/s
T
- Time/cycle
v=fλ
- v = fλ
60-second revision
- f = cycles/s
- T = time/cycle
- v = fλ
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